Bumping gaia.json for 1 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/7f1d0b46b335
Author: Vivien Nicolas <21@vingtetun.org>
Desc: Bug 945727 - [Cards View] It's difficult to tap the cross in the cards view r=julien